The drawing shows two blocks that are placed at the ends of a massless board. The board is balanced on a support that serves as an axis of rotation. The block on the left has a mass of 7.0 kg. What is the moment of inertia of this system about the axis of rotation?

The question is incomplete as the diagram wasn't attached. Please use the diagram in the attachement as a guide.

Moment of Inertia,

Step-by-step explanation:

The axis of rotation as shown in the sample diagram is the support.

Moment of Inertia, I = ∑

There are two blocks: The block on the right with a mass of 2.0kg and the block on the left with a mass of 7.0kg as we were given.

Therefore I =

he used the algebra tiles correctly.

step-by-step explanation:

given : 3x(2x-1)

solution :

since he used algebra tiles .

armando's solution is the same in the solution shown in figure

as he distributed 2x into x and x and wrote them vertically

and also write   -1 vertically

and 3x into x and x and x and wrote it horizontally

performing the multiplication in the algebra tiles we get

and solving the given expression :

3x(2x-1)

since solving the expression using tiles   and solving the expression algebraically we get the same answer

thus   we can choose the first statement as the answer to this problem which is "he used the algebra tiles correctly".